Fix crash when deleting an alarm which has an entry in the 'redo' list.
Fix crash when deleting an alarm which has an entry in the 'redo' list.

svn path=/branches/KDE/4.3/kdepim/; revision=992599

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi